Tapping attachment for drilling-machines



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U. EBERHARDT. TAPPING ATTAGHMENT FOR DRILLING MACHINES Patented Aug. 13, 1889.

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U. BBERHARDT; TAPPING ATTACHMENT FORHDRI'LLING MAGHINBS. No. 408,698. Patented-Aug. 13, 1889.

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U. EBERHARDT. TAPPING ATTAGHMENT FOR DRILLING MACHINES.

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U; 'EBERHARD'T. TAPPING ATTACHMENT FOR DRILLING MAGHINES.

Patented Aug. 13, 1889..

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UNITED STATES PATENT OFFICE.

ULRICH EBERHARDT, OF NEWARK, EEWV JERSEY.

TAPPING ATTACHMENT FOR DRILLING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 408,698, dated August 13, 1889.

Application filed February 16, 1889- $erial No. 300,154. (No model.)

To all whom it may concern.-

Be it known that I, ULRICH EBERHARDT, a citizen of the United States, residing at Newark, Essex count-y, New J ers e y, have invented certain new and useful Improvements in Apparatus for Drilling and Tapping, fully described and represented in the following specification and the accompanying drawin gs, forming a part of the same.

The object of this invention is to combine with a drilling-machine means for making a screw-thread in a drilled hole while the work is supported upon the table of such drillingmachine; and the invention consists in the combination, with the spindle. of a drilling machine and the gearing for rotating the same, of a tap-spindle sustained in a head adjacent to the drill-spindle and provided with gearing for driving such tap-spindle in opposite directions. By thus arranging a tap-spindle adjacent to the drill-spindle and providing the tap-spindle with means for turning it in opposite directions the work placed upon the carrying table or platform beneath the drill may, when a hole is drilled, be readily shifted beneath the tap and a screw-thread formed in the hole by applying the tap in the usual manner.

The invention also consists in the combination and arrangement of specific parts, as

for coupling the tap-spindle in certain cases the lower spindle bracket with the lower end of the spindle and the tapping devices secured by a footto the spindle-bracket. Fig. 4 is a side view of the same tapping device's removed from the spindle-bracket. Fig. 5 is a View of the tap-spindle shown in Fig. 3, with a portion of the bearings, the clutch-block than Figs. 1. and 2. Fig. 6 is a plan of the lower spindlebracket with the attached bearing for the tap-spindle, the view being taken in section on line'cc a: in Fig.1 and upon a slightly-larger scale. Fig. 7 is a plan of the work-table and table-arm detached from the column-upon the same scale as Fig. 6. Fig. 8 is a side view of the gear 6 detached from the bearing (1?. Fig. 9 is aplan of the gib for holding the gear in the bearing, and Fig. 10 is a plan of the gear (I, with its clutch-rollers. Fig. 11 is a detached view of the intermediate tap-spindle gear. Fig. 12 is a section on line (1 q in Fig. 5.

In Figs. 1 and 2 the drill-spindle is shown driven by a cone and belt, and the tap-spindle is shown provided with gearing driven by-a belt independently of the drill-spindle. The drill-spindle could thus be started and stopped at the pleasure of the operator by a belt shifter or clutch, as is well understood. In these figures, A is the column of the drill, with post B at the bottom, to which is clamped the table-arm B, supportinga rotary table 0. The front of the column is provided with a dovetailed guide A, to which the lowerspindlebracket D is movably fitted. The top of the column is provided with a goose-n eck A having bearing E to support one of the gears E for driving the gear-spindle F. A cone-shaft F is fitted to bearings F above the gooseneck and provided with cone F, driven by belt F as usual. 'A sleeve H is shown fitted .movably to a bearing D upon the bracket D, and the spindle is shown fitted into such sleeve and adapted to move vertically therewith by means of the drill-socket G at the lowerend of the sleeve H and collar G at the top of the sleeve H. Such sleeve is actuated, as shownin Fig. 6, by a pinion D applied to a rack upon the sleeve and by a hand-wheel H, connected with the pinion by a shaft having a bearing upon the bracket. By turning the wheel H the drill D (shown in Fig. 2) is moved to and from the work-table, while the bracket may be adjusted vertically upon the column to increase the range of the spindle, as is already well known.

a is the tap-spindle, sustained in bearings .60 and a formed upon a frame I), provided with a foot I). The foot is fitted to a seat 0 upon the side of the bracket D, and is provided with slotted holes 0, through which bolts are inserted to clamp it to the bracket. Gears (1 and c are fitted loosely to the tapspindle, and are driven in opposite directions by gears d and 6 upon an auxiliary shaft g, which is shown in Figs. 1 and 2 extended upward to connect with a cone-shaft h by means of gears h. An intermediate gear 0 connects the gears e and c to reverse the motion of the gear-wheel e. The shaft 7L and the upper end of the shaft 9 are sustained in bearings attached to the goose-neck A The shaft g is splined above the bearing c to the gear 71 so as to slip through the same when the bracket D is adjusted vertically. Cone 7L2 is driven by an independent belt 7r. The means for connecting the clutch-block f with the gears d and e is shown in the other figures; but itis evident that by coupling the tap-spindle successively to the gears (Z and cit may be rotated in opposite directions, as is required for oper ating the tap 1. Any piece of work laid upon the table 0 may therefore be readily drilled by usingthe drill I) in the usual manner. The drill being retracted, the work can be shifted beneath the tap t, and, by actuating the tapspindle and the clutching mechanism in a suitable manner, the tap be inserted in the hole and removed therefrom to form a screw-thread therein.

In radial drills, where the arm carrying the spindle is movable, it is common to use a stationary work-supporting table, upon which the work could be shifted as readily as upon. the movable table shown herein; but it is obvious that if the table be movable with the arm B around the post or column of the drill it would be necessary to arrange the tapspindle at the same distance as the drill-spindle from the center of the column, so that any piece of work fastened to the table might be shifted from the drill to the tap without loosening the work from the table. Such an arrangement is shown in Fig. 6, where the centers of the drill-spindle F and the tapspindle o. are shown arranged upon the dotted line y y concentric with the center of the post 1-3.

In Fig. 7 the relation of the table to the two spindles is clearly shown, the center of the table being shown upon a curve Z Z, extended thlough the centers of the drill and tap-spindles concentric with the post B.

In Figs. 3, l, and 5 means are shown for actuating the clutching devices by hand and also automatically, and for connecting the tap-spindle by detachable gearing with the drill-spindle, so that the movement of the drill-spindle downward in operating the drill would serve to disengage thetap-spimlle therefrom, and thus arrest its rotations, while the retraction of the drill from the work and the elevation of the drill-spindle sleeve to its highest point in the sleeve-bearing I) would couple the tap-spindle to the sleeve-spindle, and thus rotate the tap-spindle to operate upon the same piece of work. By this con struetion the rotations of the tap-spindle are automatically arrested during the use of the drill, and may be renewed as soon as the drill is retracted, such construction entirely obviating the need of a separate driving-belt for the tap-spindle, as shown in Fig. 2.

The detachable gearing consists in a cogwheel 1), attached to the shaft adjacent to the lower end of the drill-spindle sleeve-bearing D, and a cog-wheel 1), shown secured to the spindle by fastening it upon the drillsocket G adjacent to the lower end of the sleeve II.

In Fig. 3 the two cog-wheels are shown meshed together by the lifting of the sleeve II to its highest point, so that the rotation of the drill-spindle would impart the desired movement to the wheel (Z or c, and thus actuate the tap spindle reversibly, as desired. In the same figure the drill-socket G and the wheel 1) are shown in dotted lines moved downward, with the drill (also shown in dotted lin es) represented inserted in a piece of work If. Such downward movement of the spindle would obviously detach the wheel 1) from the wheel 1), and thus automatically arrest the movements of the tapping devices during the drilling operation, while the lifting of the drill from the work for the purpose of bringing the drilled hole to the tap i would automatically engage the cog-wheels p and p, and thus rotate the gearing of the tap-spindle. The tapspindle a is provided with a grooved collar 11 fixed thereto by a set-screw, (when properly adjusted,) and may be moved up or down by a tap-lever n, having weight M, to normally lift the spindle, and a handle or to press the spindle down for starting the tap in opposition to the weight m The clutch-block f and the wheel 6 are provided with clutch-teeth e to reverse the tap at a quick speed, and the opposite end of the clutch-block and the adjacent gear-wheel d are provided with rollers (l and f, which are designed to engage past their respective centers for rotating the tapspindle in tapping the drilled hole and to facilitate the withdrawal of the clutch-block from the gear automatically.

\Vhen teeth are used upon the clutch members, the friction induced upon their opposed faces in screwing the tap into the drilled hole offers a very great resistance to their separation, whereas the rollers move apart with great facility. The rolls f are shown fitted to radial studs projected from opposite sides of the clutch-block close to its lower end,and the rolls (1 are shown fitted upon radial pivots in bearings (Z fitted within a recess (1 in the upper side of the gear-wheel (Z. The rotation of the wheel. (I, when the rollers are engaged past their line of centers, as shown in Fig. 5, thus operates to turn the clutch-block, which is fitted by feathers f to slide upon the tapspindle, so as to rotate the latter while the spindle moves freely through it. To reverse the tap-spindle automatically when the tap has penetrated the drilled hole the desired depth, a depth-collar m is fitted loosely to the spindle above the bearing a and coupled to the movable end of a lever m pivoted, like 'thelever 11-, upon a seat m on the frame I).

A hand-lever 0 for moving the clutch-block downward to start the tap is shown attached to the seat bya fulcrum 0., the hand-lever being pivoted to the clutch-block in front of the fulcrum by pins 0 and in the rear of the fulcrum to a link m, connected with the lever m The link being pivoted to the lever m and the hand-lever 0 upon opposite sides of their fulcra, the downward movement of the depth-collar m operates to raise the clutchblock and to thus detach the rollers f and d. When thus detached, means are necessary to shift the clutch-block upward to engage the teeth a and such means are provided in a spring-bolt Z, pressed toward a beveled or inclined seat 0 upon the end of the lever 0 When the corner of the bolt engages with the outer corner of the inclined seat, the end of the lever is therefore moved laterally by the pressure of the bolt. A spring is inserted in a suitable socket behind the bolt operates to press it normally forward, and the downward movement of the clutchblock operates to thrust the spring-bolt backward.

The operation of the entire mechanism is as follows: The operator depresses the drillspindle to drill the hole which he desires to tap, and thereby disengages the gears 10 and p. \Vhen the drill is lifted from the finished hole, the gears 19 and p are then engaged and the gear-wheels d and rotated to actuate the tap. The work having the drilled hole is then shifted beneath the tap by turning the table 0 around upon the post B or by shifting the work upon the supporting-table. The hand-lever o is then depressed, which engages the rollers d and f past their respective centers. The strain transmitted to the rollers f operates by the interlocking of the opposed rollers past their respective centers, as shown in Fig. 5, to hold the clutch-block downward and to preventthe rolls from slipping away from one another. The tap is thus rotated in the proper direction to enter the drilled hole. The collar n being fixed upon the spindle at a suitable distance from the depth-collar m presses upon the latter when the tap has penetrated nearly to the desired depth, and. thus forces the lever m link m, and the rear end of the lever 0 down-' ward. The continued movement of the tap in the drilled hole presses the depth-collar downward until the clutch-block is raised with the centers of the rolls f above the centers of the rollers d. The rolling surfaces in cmtact with one another then produce a strong tendency to lift the rolls f and thus wholly disengage the clutch-block from the gearwheel d. The incline 0 upon the rear end of the hand-lever then reaches a point where the spring-bolt Z presses upon the incline 0, which forces the rear end of the hand-lever still farther downward and throws the clutch-block upward to engage the teeth e as shown in Fig. 4:. The continued pressure of the bolt upon the incline 0 then serves to hold such teeth in contact until the operator presses the clutch-block downward. The engagement of i the work, so that the latter may be removed.

Thecollar n is made adjustable upon the tapspindle to regulate its automatic operation in reversing the tap in drilling holes of various depths, and by making allowance for the slight movement of the depth-collar in separating the rolls d and f a scale may be used upon the tap-spindle to set the collarnat the desired point. Such scale is shown at a in a series of marks numbered in inches to express the proper setting of the collar for a hole of corresponding depth.

Where it is necessary to use a drilling-machine for a considerable time without actuating the tap-spindle, the gears 19 and 19 may be separated from one another by a backward movement of the frame I), carrying the entire tapping apparatus. Such backward movement is effected by slackening the bolts applied to the slotted holes 0 and shifting the frame backward upon the drill-spindle bracket D. The sleeve H may then be moved upward to its normal height without engaging the gears 19 and 19. hen it is desired to use the tapping apparatus, it may be connected with the drill-spindle by again shifting the frame 1) forward.

It is obviously immaterial to the proper operation of the tap-spindle in opposite directions whether the clutch-block be provided with teeth at its upper end and rollers at its lower ,end or the contrary; but by my construction the weight of the clutch-block and the hand-lever attached thereto operates to hold the rollers engaged past their respective centers during the tapping operation until lifted by the operation of thedepth-collar acting through suitable connections.

I am aware that it is not new to mount a drill-spindle and tap-spindle upon the same frame over a stationary table and to drive the same by independent belts, as in United States Patent No. 342,496, dated-May 25,1886, and I do not, therefore, claim such device as my invention.

My construction differs from that just referred to partly in having gearing which is connected with the gearing for driving the drill-spindle in a single direction, and also with the gearing for driving the tap-spindle in opposite directions, and partly in the combination, with the drill and tap spindle, of a movable table adapted to shift the work when fastened upon the same directly from under the drill to a corresponding point under the tap without loosening the work from the table. By my first construction I am enabled to apply a tapping device to any existing drilling-machine by providing the suitable intermediate gearing to connect the gearing of the drill with the gearing of the tap, and by my second construction I am enabled to hold the work more securely upon the table by drilling and tapping it than if the work were laid loosely upon the fixed table and shifted from one tool to the other when required.

Having thus set forth my invention, what I claim herein is 1. The combination, with the spindle of a d rilling-machine and the gearing for rotating the same, of a tap-spindle mounted in a head sustained adjacent to the drill-spindle, gearing for driving such tap-spindle in opposite directions, and gearing connected with the same and with the gearing of the drill-spindle, and a movable table for applying the work in succession to the drill and tap, substantially as herein set forth. Y

2. The combination, with the spindle of a drilling-machine and the gearing for rotating the same, of a tap-spindle mounted in a head sustained adjacent to the drill-spindle, gearing for driving such tap-spindle in opposite directions, and gearing connected detachably with the same and with the gearing of the drill-spindle, and a movable table for applying the work in succession to the drill and tap, substantially as herein set forth.

The combination, with a column-drill, of a table, a table-arm supporting the same and movable around the column, a drill-spindle and tap-spindle sustained by the column of the drill, gearing for driving the drill-spindle to drill holes, gearing for driving the tapspindle in opposite directions, and gearing connected with the same and with the gearing of the drill-spindle, substantially as herein set forth.

4. The combination, with the spindle of a drilling-machine and the gearing for rotating the same, of a tap-spindle, a head affixed to the lower drill-spindle bracket, gearing to reverse the tap-spindle, a toothed couplingwheel inserted in such gearing adjacent to the lower side of the drill-spindle bracket, and a cog-wheel fixed upon the drill-spindle and movable therewith to mesh at pleasure with the coupling-wheel, as and for the purpose set forth.

5. The combination, with a column-drill having a table and a table-arm movable around the column and having a drill-spindle bracket adapted to sustain the drill concentric with the table, of a tap-spindle head sustained adjacent to the drill-spindle and adapted to sustain the tap-spindle concentric with the table when the latter is moved around the column, and gearing for reversing the drill-spindle, as and for the purpose set forth.

6. The combination, with a tap-spindle and suitable bearings for sustaining the same, of

two gear-wheels fitted loosely upon the spin- (lle and rotated in opposite directions, a clutch-block feathered upon the spindle and movable between the gear-wheels, teeth upon the clutch-block and upon one of the gearwheels for driving the spindle in one direction, and rollers ai'lixed to the clutch-block and the other gear-wheel and moved into contact with one another past their respective centers for driving the spindle in the opposite direction, substantially as herein set forth.

'7. The combination, with a tap-spindle and suitable bearings for sustaining the same, of two gear-wheels fitted loosely upon the spindle and rotated in opposite directions, a clutch-block feathered upon the spindle and movable between the gear-wheels, teeth upon the clutch-block and upon one of the gearwheels for driving the spindle in one direction, rollers affixed to the clutch-block and the other gear-wheel and adapted to engage past their respective centers for driving the spindle in the opposite direction, a lever having a fixed fulcrum and pivoted at one side of the fulcrum to the clutch-block and provid'ed at the other side of the fulcrum with a sloping face, a spring-dog adapted to press the lever laterally when engaged with such face, and a handle applied to the lever for shifting the clutch-block toward either of the gear-wheels, substantially as herein set forth.

8. The combination,with a tap-spindle and suitable bearings for sustaining the same, of two gear-wheels fitted loosely upon the spindle and rotated in opposite directions, a clutchblock feathered upon the spindle and movable between the gear-wheels, teeth upon the clutch-block and upon one of the gear-wheels for driving the spindle in one direction, rollers affixed to the clutch-block and the other gearwheel and adapted to engage past their respective centers for driving the spindle in the opposite direction, a lever having a fixed fulcrum and pivoted at one side of the fulcrum to the clutch-block and provided with a handle, the link m, pivoted to the lever at the opposite side of the fulcrum, the depth-collar m, the arm m pivoted to the link and actuated by such collar, and the collar n, fixed upon the spindle above the depth-collar m and adapted when moved downward into contact with the latter to raise the clutch-block into contact with the reversing gear-wheel, substantially as herein set forth.

9. The combination, with a tap-spindle and suitable bearings for sustaining the same, 'of two gear-wheels fitted loosely upon the spindle and rotated in opposite directions, a clutchbloek feathered upon the spindle and movable upon the gear-wheels, teeth upon the clutchblock and upon one of the gear-wheels for driving the spindle in one direction, rollers affixed to the clutch-block and the other gear-wheel and adapted to engage past their respective centers for driving the spindle in the opposite direction, a lever having a fixed fulcrum and pivoted at one side of the fulcrum to the clutch-block and provided with a handle, the link m, pivoted to the lever at the opposite side of the fulcrum, the collar m the arm m pivoted to the link and actuated by such collar, the collar n, fixed upon the spindle, the tap-lever 'n, actuated by such fixed collar, the Weight 71?, for moving the lever to normally raise the spindle, and the handle n for pressing the spindle downward, as and for the purpose set forth.

10. The combination, with the spindle of a drilling-machine and the gearing for rotating the same, of a tap-spindle mounted in a movable frame adjacent to the dril1-spindle,and gearing for driving such tap-spindle in opposite directions, connected with the gearing of the drill-spindle, the movable frame being adapted by its movement to detach the gearing of the tap-spindle from the gearing of the drill-spindle, as and for the purpose set forth.

'11. The combination,with a tap-spindle and suitable bearings for sustaining the same, of

two gear-wheels fitted loosely upon the spindle and rotated in opposite directions, a clutch block feathered upon the spindle and movable between the gear-wheels and adapted to engage with either of such gear-wheels, a depth- 'collar fitted loosely to the tap-spindle above ULRICH EBERIIARDT.

' Witnesses:

THOS. S. CRANE, H. J. MILLER. 

